This annoying bug has been reported a year ago and it is sad to see that there is no fix yet. I have used F.lux on windows for long and this bug on Mac is kinda making me look for alternatives to F.lux which I really don't want to do.

It makes the program completely useless in my opinion. If I have to keep turning it off, it is doing me no good in terms of helping with my body's sleep cycle confusion.

Flux replies so far have indicated there will be no fix. I'm still following the thread and hoping they sort it out, but it doesn't seem like anybody cares or is working on it. Can anybody recommend a different program? I give up with this.

I've gotten around the issue thanks to this little app: Shady for Mac.

What's a little strange but very good for this specific purpose is that just running the app with the "shade" setting off still fixes the problem. I'm guessing it's doing something similar to gfxcardswitcher in the background, as soon as it's running, so it's probably affecting battery life too (although I haven't paid attention to that myself).

And of course, turning the thing actually on and reducing the brightness to a minimum ain't bad for your eyes either.

@shinz4u Sorry, not sure about Chrome. There are probably extensions available that let you add your own CSS rules, but I haven't looked into it. I might publish my own extensions to make it easier for everyone.

I actually am not using f.lux at the moment, but I calibrated my laptop display with a lower color temperature than normal, and it has the same bug that you get with f.lux -- videos have artifacts in the brightest parts, but only when they are full screen with nothing else composited on top of them. Maybe the video driver uses an optimization for this case that doesn't quite work.

Click the button with the "arrow pointing into a box" at the very top left of the Developer Tools window to "inspect an element" (or hit cmd+shift+c).

Click the Netflix video element to inspect it. This should bring up the Elements tab in the Developer Tools window with the "video" element selected.

At the top right of the Developer Tools window, you should see a little section that says "element.style" with a few list items underneath. Click the bottom of that section and add opacity: 0.996 !important; as a new list item.

Go full screen and watch a beautifully artifact-free video.

You'll have to do this every time you open a new video in Chrome, but it only takes a few seconds. I'm sure it can be done more permanently with an extension, as @chris-l said though.

PS: Thanks to the f.lux team for a great piece of software! It's a lifesaver. I know this bug isn't your fault.

I'm even having this problem with the new update. Before everything was working fine, now i start seeing some difference on the white color when i'm full screen on youtube. After all the buttons hides, the color white become strange.
I'm using MacBook Pro Mid 2015, Intel Iris Pro 1536 MB

Thanks for the feedback, I will try to look into energy usage & see it it makes a difference. Also I should point out that the browser extension is applying the style to all videos, not just YouTube & Netflix. In future I might make it more specific again, though it does mean we would have to deal with changes to web site designs that break it.

@chris-l thanks for the extensions! Does this apply to all videos, or only full-screen playback? I haven't tried it yet, but I think lowering the opacity would have some undesired effect on the color and contrast, no?

Thanks for the feedback. Yes the extension is applying to all videos, full screen or not. The opacity is only reduced by the smallest possible amount, so I would hope it has minimal to no perceptible effect. (Only 0.4% of the background color will be blended into the video). But yes there are other ways I could try -- like the box-shadow rule that was mention earlier. I think what we are doing is forcing the browser to render the video in a way that doesn't trigger the bug. Probably there are a bunch of ways to do it.

Have been having issues both in Chrome and Safari with this neon affect coming on while I am trying to watch Narcos... as well as in YouTube, at first I thought it was my computer graphics and was getting worried, but when disabling f.lux (v 37.7) the problem is solved. This is a bummer as I need f.lux to help me maintain my sleep cycle and I watch a lot of videos at night. I tried the f.lux fixer chrome extension, but it only worked for youtube

I hope this helps at least SOME people. I simply went into system preferences > energy saver. Then on the top left of that page I unchecked the "automatic graphics switching" box. Suddenly I can fullscreen everything with no issue.

@isayuh Thanks - this avoids the issue, which appears to happen with Intel GPUs, by using the discrete GPU instead (NVIDIA or AMD, which do not have the problem). Of course, it only works on machines with two GPUs.

@omgwtfbbq So cool, I'm sitting with my late 2013. It will last me a long time thanks to ssd and retina.

I don't really remember why this fixes the issue, I think it makes an element render differently. It's not like it's switching off hardware acceleration or something. I'm sure it will be insignificant comparing to actually playing a video.

@omgwtfbbq I would guess that the CSS just turns off the "fully accelerated" path, but it is still using the GPU to do the compositing and decoding. (i.e. there is likely a battery hit but it may not be very big.)

@herf Makes sense. I've found that the issue occurs when the video is the primary element in focus on the screen.
If a banner ad, video controls, system volume controls, etc are the primary window then the issue does not occur. Whereas if the video is then it occurs.

Apple has reported this video bug fixed in the latest Safari. This seems to be true. Progress! (Thanks Safari team!)

However, because it is fixed in Safari, it still appears in several other apps that play video, including desktop Quicktime and Chrome (AVFoundation or QTKit? We don't know.) For now, Chrome users should use the plugin.

I'm still having this issue too, and it's very irritating. Weirdly, a similar thing is also happening from time to time on my iPhone, which does not have f.lux installed on it, but is using Apple's new built-in Nightshift.

I'm assuming this wasn't fixed since I'm having the same issue. I have a late-2016 MacBook Pro 13,1 running Intel Iris Graphics 540 and macOS 10.12.2. This is happening with any video I run in full screen on Chrome 54.0.2840.98. I don't use Safari so I can't speak to that.

@enrique I have the same problem with Safari on the new MacBook Pro 13" with Touchbar on the latest version of macOS. It isn't as noticeable as it was back on my old MacBook mid-2012 but if you look closely you can see still artifacts in the video which go away when moving the mouse.